@inproceedings{Power_et_al_2005e,
  title = "On {XACML}, role-based access control, and health grids",
  author = "Power, D.~J. and Slaymaker, M.~A. and Politou, E.~A. and Simpson, A.~C.",
  year = "2005",
  booktitle = "Proceedings of the 2005 UK e-Science All Hands Meeting",
}